67% (2007)

67% (2003)

60% (1997)

67% (2000)

68% (2004)

57% (2004)

51% (2003)

46% (2004)

59% (2006)

59% (2001)

54% (2012)

56% (1999)

61% (2009)

70% (2002)

25% (2004)

58% (1993)

30% (2000)

52% (2001)

0% (1971)

20% (1994)